EP2540999B1 - Joint de tige de vanne pour moteur à combustion - Google Patents

Joint de tige de vanne pour moteur à combustion Download PDF

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Publication number
EP2540999B1
EP2540999B1 EP11171882.1A EP11171882A EP2540999B1 EP 2540999 B1 EP2540999 B1 EP 2540999B1 EP 11171882 A EP11171882 A EP 11171882A EP 2540999 B1 EP2540999 B1 EP 2540999B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve stem
stem seal
guide
valve guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11171882.1A
Other languages
German (de)
English (en)
Other versions
EP2540999A1 (fr
Inventor
Hendrik Herold
Hartmut Bartel
Ulrich Holst
Ole Ehlert
Jan Rodenbeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Caterpillar Motoren GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Motoren GmbH and Co KG filed Critical Caterpillar Motoren GmbH and Co KG
Priority to EP11171882.1A priority Critical patent/EP2540999B1/fr
Priority to CN2012102298266A priority patent/CN102852583A/zh
Priority to US13/537,286 priority patent/US20130000588A1/en
Publication of EP2540999A1 publication Critical patent/EP2540999A1/fr
Application granted granted Critical
Publication of EP2540999B1 publication Critical patent/EP2540999B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making

Definitions

  • the present disclosure generally relates to a valve stem seal and, more particularly, to a valve stem seal for a valve of a combustion engine.
  • valve assemblies of combustion engines in particular, inlet or exhaust valves of a combustion engine, lubricant such as, e.g., oil, is supplied to a valve guide and a valve stem movably disposed in the valve guide via a valve stem seal to inhibit wear.
  • lubricant such as, e.g., oil
  • a valve stem seal for example, a double lip seal may be used.
  • valve stem seals are disclosed, for example, in US 5,110,142 and US 4,834,037 .
  • valve stem seals the amount of lubricant entering the valve guide may not be sufficient to provide correct lubrication for the valve of the combustion engine over the life of the engine. For example, after extended periods of operating the engine, undesired wear of the valve guide and/or the valve stem may occur, effecting operation of the combustion engine and potentially leading to damaging of components of the same.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of prior systems.
  • a valve stem seal for a combustion engine may comprise a cylindrical body including a mounting portion and a valve stem sealing portion integrally formed with the mounting portion, and an o-ring configured for sealing engagement with a valve stem reciprocating in a valve guide of a valve of the combustion engine.
  • the mounting portion may define an opening for receiving an upper end of the valve guide and may be configured for substantially fluid-tight engagement with the upper end of the valve guide.
  • the valve stem sealing portion may include an annular groove formed in an inner surface of the cylindrical body. The o-ring may be received in the annular groove.
  • a combustion engine may comprise an engine block at least partially defining a plurality of cylinders, each of the plurality of cylinders being associated with at least one inlet valve and at least one exhaust valve, and a valve stem seal attached to at least one of the inlet or exhaust valves of the plurality of cylinders.
  • the valve stem seal may comprise a cylindrical body including a mounting portion and a valve stem sealing portion integrally formed with the mounting portion, and an o-ring configured for sealing engagement with a valve stem reciprocating in a valve guide of an inlet or exhaust valve.
  • the mounting portion may define an opening for receiving an upper end of the valve guide and may be configured for substantially fluid-tight engagement with the upper end of the valve guide.
  • the valve stem sealing portion may include an annular groove formed in an inner surface of the cylindrical body. The o-ring may be received in the annular groove.
  • a method of adjusting lubrication of an inlet or exhaust valve in a combustion engine may comprise removing a first valve stem seal from the upper end of the valve guide, the first valve stem seal being configured to allow a first amount of lubricant to enter the valve guide during reciprocation of the valve stem, and attaching a second valve stem seal to the upper end of the valve guide, the second valve stem being configured to allow a second amount of lubricant that is greater than the first amount to enter the valve guide during reciprocation of the valve stem, thereby increasing an amount of lubricant in the valve guide.
  • the second valve stem seal may comprise a cylindrical body including a mounting portion and a valve stem sealing portion integrally formed with the mounting portion, and an o-ring configured for sealing engagement with the valve stem reciprocating in the valve guide of the inlet or exhaust valve of the combustion engine.
  • the mounting portion may define an opening for receiving an upper end of the valve guide and may be configured for substantially fluid-tight engagement with the upper end of the valve guide.
  • the valve stem sealing portion may include an annular groove formed in an inner surface of the cylindrical body. The o-ring may be received in the annular groove.
  • a retrofitting method for a combustion engine having a plurality of cylinders may comprise attaching a valve stem seal to a valve guide of one of the at least one inlet valve and the at least one exhaust valve.
  • the valve stem seal may comprise a cylindrical body including a mounting portion and a valve stem sealing portion integrally formed with the mounting portion, and an o-ring configured for sealing engagement with a valve stem reciprocating in a valve guide of an inlet or exhaust valve.
  • the mounting portion may define an opening for receiving an upper end of the valve guide and may be configured for substantially fluid-tight engagement with the upper end of the valve guide.
  • the valve stem sealing portion may include an annular groove formed in an inner surface of the cylindrical body. The o-ring may be received in the annular groove.
  • the present disclosure may be based in part on the discovery that replacing a valve stem seal of a combustion engine having a first configuration by a valve stem seal having a second configuration, which allows for an increased amount of lubricant to enter a valve guide of an inlet or exhaust valve of a combustion engine, may provide a sufficient amount of lubrication for the valve after operation of the combustion engine over extended periods of time.
  • valve stem seal it may become possible to control the amount of lubrication provided to the valve guide during the service life of a combustion engine.
  • a valve stem seal such as, for example, a double lip valve stem seal that allows for a relatively small amount of lubricant to enter the valve guides of the valves of the combustion engine. If, however, after an extended period of time of operating the engine, it is found that the amount of lubricant is not sufficient, the factory valve stem seal may be replaced by the valve stem seal according to the present disclosure, thereby increasing an amount of lubricant in the valve guide.
  • valve stem seal may be provided between the valve stem and an upper end of the valve guide. During reciprocation of the valve stem in the valve guide, an amount of lubricant may enter the valve guide via the seal.
  • an o-ring valve stem seal as disclosed herein may allow increasing the amount of lubricant supplied to a valve guide in the combustion engine.
  • attaching an o-ring valve stem seal to an upper end of the valve guide via an adapter may allow for a more efficient replacement of valve stem seals of a combustion engine.
  • valve stem seal without changing the valve guide by mounting the o-ring valve stem seal as disclosed herein to the upper end of a valve guide, reducing warranty costs and dealer expense due to lower field activities.
  • installing an o-ring in a valve stem seal of a combustion engine may enable adjusting a flow of lubricant in the valve guide to provide a correct amount of lubrication.
  • an internal combustion engine 100 may include an engine block 101 that at least partially defines a plurality of cylinders 102, a piston 110 slidably disposed within each cylinder 102, and a cylinder head 104 associated with each cylinder 102.
  • Engine 100 may include a plurality of inlet valves 106 and exhaust valves 108 associated with the plurality of cylinders 102.
  • An example of engine 100 may be a natural gas, spark ignited, V-style turbocharged and aftercooled engine that may have, for example, 12 or 16 cylinders, each cylinder having, for example, 2 inlet and 2 exhaust valves.
  • engine 100 may be any other type of internal combustion engines such as, for example, a dual fuel powered engine.
  • engine 100 may include a greater or lesser number of cylinders 102, and cylinders 102 may be disposed in an "in-line" configuration, or in any other suitable configuration.
  • inlet valves 106 and exhaust valves 108 may open and close to allow a mixture of gas and air to enter each cylinder, and to allow a flow of exhaust to exit each cylinder, respectively.
  • FIG. 2 shows an enlarged cross-sectional view of inlet valve 106 and exhaust valve 108 of combustion engine 100.
  • Inlet valve 106 and exhaust valve 108 may have a similar configuration, such that only the configuration of exhaust valve 108 will be described in detail in the following. However, it should be appreciated that the same description also applies to inlet valve 106.
  • Exhaust valve 108 may include a valve guide 40 and a valve stem 42.
  • Valve guide 40 may have an elongated cylindrical shape having a lower end 41, an upper end 43, and a through hole 45. Valve guide 40 may be secured to cylinder head 104 in a known manner.
  • Valve stem 42 may be disposed in through hole 45 of valve guide 42 such that it may slide inside through hole 45. Valve stem 42 may be biased into a closing position via a biasing spring 47 and may be actuated to move to an opening position via an actuating mechanism 112 connected to, e.g., a camshaft 114 of engine 100 (see FIG. 1 ). In alternative configurations, a common rail system may be used to actuate the valves.
  • valve stem seal 10 (only schematically shown in Fig. 2 ) may be attached to upper end 43 of valve guide 40 to be in sealing engagement with valve stem 42.
  • Valve stem seal 10 may be configured to allow an amount of lubricant present in a space above cylinder head 104 to enter the inside of valve guide 40 during reciprocating movement of valve stem 42 inside through hole 45 of valve guide 40.
  • valve stem seal 10 may be configured to allow a first amount of lubricant, e.g., oil, to enter valve guide 40 during movement of valve stem 42.
  • the first amount may be a relatively small amount providing a relatively small amount of lubrication for exhaust valve 108, e.g., using valve stem seals such as the ones disclosed in US 5,110,142 and US 4,834,037 .
  • valve stem seals such as the ones disclosed in US 5,110,142 and US 4,834,037 .
  • FIG. 3 shows a valve stem seal 10 that may allow for a relatively larger amount of lubricant to enter valve guide 40.
  • valve stem seal 10 may include a cylindrical body 12. Cylindrical body 12 may, for example, be cup-shaped. Cylindrical body 12 may, for example, be made of metal. Cylindrical body 12 may include a mounting portion 16 and a valve stem sealing portion 14. Mounting portion 16 and valve stem sealing portion 14 may be integrally formed with each other, for example, to provide rigidity and stability and allow for easy installation of the valve stem seal assembly, for example, by press-fitting.
  • Mounting portion 16 may define an opening 18 on one side of cylindrical body 12, and may include one or more convex engagement portions 28 protruding from an inner surface of cylindrical body 12 into opening 18.
  • Opening 18 may be configured to receive upper end 43 of valve guide 40.
  • Convex engagement portion(s) 28 may protrude into opening 18 and may be configured to engage with a reduced diameter portion 46 formed on upper end 43 of valve guide 40.
  • reduced diameter portion 46 may be a groove formed in valve guide 40.
  • Mounting portion 16 may be configured for substantially fluid-tight engagement with upper end 43 of valve guide 40 via engagement portion 28.
  • mounting portion 16 may be attached to valve guide 40 by press-fitting or the like.
  • opening 18 may have an inner diameter that may be somewhat smaller that an outer diameter of valve guide 40.
  • inner diameter of opening 18 may be smaller than outer diameter of valve guide 40 by around 0.5% such that mounting portion 16 may deform slightly during press-fitting of valve stem seal 10 to valve guide 40, resulting in a secure and substantially fluid-tight connection of valve stem seal 10 to valve guide 40.
  • mounting portion 16 may further include an o-ring 30 installed in an annular groove 32 formed inside opening 18.
  • O-ring 30 may be configured for sealing engagement with an outer surface of valve guide 40 to contribute to the fluid-tight sealing between valve guide 40 and valve stem seal 10.
  • o-ring 30 may be configured to prevent blow-by of, e.g., exhaust, which may result in lubricant on inner surface 45 of valve guide 40 being pushed upward, leaving part of valve guide 40 without sufficient lubrication.
  • Valve stem sealing portion 14 may include an annular groove 22 formed in an inner surface 24 of cylindrical body 12, and an o-ring 26 received in annular groove 22.
  • Valve stem sealing portion 14 may be configured to allow for at least a predetermined amount of lubricant, e.g., oil, to enter valve guide 40 during reciprocation of valve stem 42 in valve guide 40.
  • the predetermined amount may depend on several factors, for example, wear of the valve stem and/or the valve guide, emission regulations, operating hours of the engine, operating conditions, an operating environment, etc. In some embodiments, the predetermined amount may be larger than, for example, in the embodiments disclosed in, e.g., US 5,110,142 and US 4,834,037 .
  • O-ring 26 may be configured for sealing engagement with valve stem 42 (not shown), which reciprocates in valve guide 40.
  • O-ring 26 may be made of an elastic material such as fluoropolymer rubber (FPM).
  • FPM fluoropolymer rubber
  • O-ring 26 may be formed as a ring having a circular cross-section and a constant thickness of, e.g., around 5 mm and a diameter of, for example, 26 mm.
  • Annular groove 22 may be configured to allow for movement of o-ring 26 in an axial direction of cylindrical body 12 during reciprocation of valve stem 42 in valve guide 40.
  • annular groove 22 may, for example, have a height in the axial direction of cylindrical body 12 of around 5,3 mm. Accordingly, o-ring 26 may roll inside annular groove 22 during reciprocation of valve stem 42, thereby delivering the predetermined amount of lubricant, e.g., oil, to the inside of valve guide 40.
  • valve stem seal of the present disclosure may have a wide application in a plurality of engine types including, for example, gas engines and dual fuel powered engines.
  • the disclosed valve stem seal may be implemented in any engine that utilizes a first valve stem seal configuration to limit the amount of lubricant entering a valve guide of an inlet or exhaust valve in the engine in view of emission regulations. After operating such a combustion engine over an extended period of time, it may become necessary to increase the amount of oil that enters the valve guide via the oil stem seal to inhibit or react to wear of, for example, the valve guide and/or the valve stem.
  • a first valve stem seal for example, a factory valve stem seal
  • the valve stem seal of the present disclosure may be attached to the upper end of valve guide to allow a relatively larger amount of lubricant to enter the valve guide during reciprocation of the valve stem.
  • the present disclosure may provide a retrofitting method for a combustion engine such as, for example, a gas engine, that may allow for an adjustment of the lubrication provided for inlet or exhaust valve of the engine in a sufficient manner.
  • a combustion engine such as, for example, a gas engine
  • valve guide 40 By installing the o-ring inside cylindrical body 12, which may be integrally formed, and press-fitting cylindrical body 12 to upper end 43 of valve guide 40 (see FIG. 3 ), it may not be necessary to remove valve guide 40 from engine 100 during replacement. Instead, only a cover portion disposed over cylinder head 104 (see FIG. 1 ) may have to be removed to replace the valve stem seal. Thus, the amount of time and manpower for replacing, for example, all the valve stem seals in combustion engine 100, may be significantly reduced, reducing warranty costs and dealer expenses due to lower field activities.
  • valve stem seal 10 after the valve stem seal 10 has been installed in the combustion engine 100, the lubrication provided by the seal may be monitored at regular intervals, and, if necessary, the valve stem seal may again be replaced to increase or decrease an amount of lubricant supplied to the valve guide.
  • the configuration of the valve stem seal may be adjusted to result in a desired amount of lubrication, for example, by selecting an appropriate size O-ring having a particular diameter and/or cross-section.
  • o-ring 26 in the valve stem seal according to the present disclosure may be easily replaced.
  • internal combustion engine may refer to internal combustion engines such as, for example, gas engines, which may be used as main or auxiliary engines of stationary power providing systems such as power plants for powering pipeline transmission, processing, or gas storage and withdrawal, as well as for generating electricity.
  • Fuel for the internal combustion engines may include natural gas, a combination of natural gas and another fuel, for example, diesel fuel, and the like.
  • Examples of internal combustion engines for the herein disclosed implementation of the valve stem seal may include, for example, V-type engines of the series GCM34 manufactured by Caterpillar Motoren GmbH & Co. KG, Kiel, Germany, operated in the range of 450-750 rpm.
  • Such internal combustion engines may be large stand-alone engines that may provide easy access to the inlet and exhaust valves of the combustion engine for attachment of the valve stem seal of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Lift Valve (AREA)

Claims (14)

  1. Joint (10) de tige de soupape pour moteur à combustion, comprenant :
    un corps cylindrique (12) incluant une partie de montage (16) et une partie de joint de tige de soupape (14) formée intégralement avec la partie de montage (16), la partie de joint de tige de soupape (14) incluant une rainure annulaire (22) formée dans une surface interne (24) du corps cylindrique (12) ; et
    un joint torique (26) configuré pour s'engager de façon étanche avec une tige de soupape (42) qui se meut en un mouvement de va-et-vient dans un guide de soupape (40) d'une soupape du moteur de combustion,
    dans lequel la partie de montage (16) définit une ouverture (18) pour recevoir une extrémité supérieure (43) du guide de soupape (40), et le joint torique (26) est réceptionné dans la rainure annulaire (22).
  2. Joint de tige de soupape selon la revendication 1, dans lequel la partie de joint de tige de soupape (14) est configurée pour permettre à au moins une quantité prédéterminée de lubrifiant de pénétrer dans le guide de soupape (40) durant le mouvement de va-et-vient de la tige de soupape (42) dans le guide de soupape (40).
  3. Joint de tige de soupape selon la revendication 1 ou 2, dans lequel le joint torique (26) est disposé dans la rainure annulaire (22) avec un espace libre de façon à pouvoir tourner dans une direction axiale du corps cylindrique (12) durant le mouvement de va-et-vient de la tige de soupape (42) dans le guide de soupape (40).
  4. Joint de tige de soupape selon l'une quelconque des revendications 1 à 3, dans lequel le joint torique (26) est réalisé en un matériau élastique tel qu'un caoutchouc à base d'un fluoropolymère et présente une épaisseur d'approximativement 5 mm et un diamètre d'approximativement 26 mm.
  5. Joint de tige de soupape selon l'une quelconque des revendications 1 à 4, dans lequel le corps cylindrique (12) est configuré pour être attaché au guide de soupape (40) par connexion par pressage.
  6. Joint de tige de soupape selon la revendication 5, dans lequel la partie de montage (16) inclut au moins une partie convexe (28) d'engagement faisant saillie à partir d'une surface interne du corps cylindrique (12) et agencée pour s'engager à une partie à diamètre réduit (46) du guide de soupape (40) lors de la connexion par pressage du corps cylindrique (12) au guide de soupape (40).
  7. Joint de tige de soupape selon l'une quelconque des revendications 1 à 6, dans lequel le joint torique (26) est un premier joint torique, et la partie de montage (16) inclut un deuxième joint torique (30) configuré pour s'engager de façon étanche avec une surface externe (48) du guide de soupape (40) pour empêcher une fuite de gaz.
  8. Joint de tige de soupape selon l'une quelconque des revendications 1 à 7, dans lequel le corps cylindrique (12) est réalisé en métal.
  9. Moteur à combustion (100) comprenant :
    un bloc moteur (101) définissant au moins partiellement une pluralité de cylindres (102), chacun de la pluralité de cylindres (102) étant associé avec au moins une soupape d'entrée (106) et au moins une soupape d'échappement (108) ; et
    le joint (10) de tige de soupape selon l'une quelconque des revendications 1 à 8 attachée à au moins une des soupapes d'entrée (106) et des soupapes d'échappement (108) de la pluralité de cylindres (102).
  10. Méthode d'ajustement de la lubrification d'une soupape d'entrée ou d'échappement dans un moteur à combustion, la soupape d'entrée ou de sortie incluant un guide de soupape et une tige de soupape agencée par glissement dans le guide de soupape, comprenant :
    une étape d'enlèvement d'un premier joint de tige de soupape à partir d'une extrémité supérieure du guide de soupape, le premier joint de tige étant configuré pour permettre à une première quantité de lubrifiant de pénétrer dans le guide de soupape durant le mouvement de va-et-vient de la tige de soupape ; et
    une étape de fixation d'un deuxième joint de tige de soupape selon l'une quelconque des revendications 1 à 8 à l'extrémité supérieure du guide de soupape, le deuxième joint de tige étant configuré pour permettre à une deuxième quantité de lubrifiant de pénétrer dans le guide de soupape durant le mouvement de va-et-vient de la tige de soupape, de façon à augmenter ainsi la quantité de lubrifiant dans le guide de soupape.
  11. Méthode selon la revendication 10, incluant en outre une étape de sélection de la taille du joint torique (26) pour permettre à une quantité prédéterminée de lubrifiant de pénétrer dans le guide de soupape.
  12. Méthode selon la revendication 10 ou 11, incluant en outre une étape de fixation du deuxième joint (10) de tige à l'extrémité supérieure du guide de soupape par pressage.
  13. Méthode selon l'une quelconque des revendications 10 à 12, incluant en outre :
    une étape d'enlèvement du deuxième joint de tige ;
    une étape de remplacement du joint torique (26) du deuxième joint de tige ; et
    une nouvelle étape de fixation du deuxième joint de tige.
  14. Méthode de réglage d'un moteur à combustion présentant une pluralité de cylindres (102), chacun de la pluralité de cylindres (102) étant associé avec au moins une soupape d'entrée (106) et au moins une soupape d'échappement (108), comprenant :
    une étape de fixation du joint de tige de soupape selon l'une quelconque des revendications 1 à 8 à un guide de soupape d'une de ladite au moins une soupape d'entrée (106) et d'une de ladite au moins une soupape d'échappement (108).
EP11171882.1A 2011-06-29 2011-06-29 Joint de tige de vanne pour moteur à combustion Not-in-force EP2540999B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP11171882.1A EP2540999B1 (fr) 2011-06-29 2011-06-29 Joint de tige de vanne pour moteur à combustion
CN2012102298266A CN102852583A (zh) 2011-06-29 2012-06-28 用于内燃机的阀杆密封结构
US13/537,286 US20130000588A1 (en) 2011-06-29 2012-06-29 Valve stem seal for a combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11171882.1A EP2540999B1 (fr) 2011-06-29 2011-06-29 Joint de tige de vanne pour moteur à combustion

Publications (2)

Publication Number Publication Date
EP2540999A1 EP2540999A1 (fr) 2013-01-02
EP2540999B1 true EP2540999B1 (fr) 2014-07-09

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EP11171882.1A Not-in-force EP2540999B1 (fr) 2011-06-29 2011-06-29 Joint de tige de vanne pour moteur à combustion

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US (1) US20130000588A1 (fr)
EP (1) EP2540999B1 (fr)
CN (1) CN102852583A (fr)

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CN101230791A (zh) * 2008-01-07 2008-07-30 蔡道德 一种带有密封圈的内开式进气门
DE102009016016B4 (de) * 2009-04-02 2022-06-30 Ab Skf Ventilschaftdichtung

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